As posted on Maplantis:

In all of my previous mods ( my first, NovaCraft, with Tempest Replay, and a bunch of unfinished/testbed mods ) , I've had troubles with the Firebat.
When I tell it to attack, it'll shoot once, and then just do nothing. He'll stand there with his arms raised, refusing to rptattk. Depending on just how I change it, he'll even freeze there, ignoring any subsequent commands I give him.
If you look at any of my mods, I've modified plenty, plenty of other attack scripts. I've tried completely replacing the Firebat iscript ( including header information ) with the Ghost's, and then changing appropriate values ( ID, imgul pointers, etc. ) , but still no luck.

Anyone know why? Hardcoded, some obscure *.dat value I've overlooked?

make some icebats. that would be cool.

I'm not sure, but sometimes you need to add an "ignorerest" (IceCC 1.3) at the end of the attack script.

Ghosts ( and almost all units, for that matter ) include that opcode. So that's not the problem.

It's solved now ( for those interested, the Maplantis thread has more replies and information ) . Apparently, Firebats want to have a Goto FirebatWalkingToIdle opcode before the next animation header ( i.e., InitialGroundAttkToIdle ) , whereas most units just need it to be in the sequence